1 6
1 6
11 Inspect Charge Relief Valve for:
a. improper charge relief pressure setting *
b. damaged or broken spring
c. poppet valve held off seat
12 Inspect Motor for:
a. disconnected coupling
13 Inspect Charge Pump for:
a. broken or missing drive key
b. damaged or missing o-ring
c. excessive gerotor clearance
d. galled or broken gerotor set
* System/Charge Relief Valve
Pressure Settings for
Eaton’s Variable Displacement
Controlled Piston Pumps
Inlet Vacuum
6 inHg max.
Case Pressure
25 lbf/in
2
maximum
Charge Pressure
100 to 150 lbf/in
2
Standard
200 to 250 lbf/in
2
Optional
250 to 300 lbf/in
2
Optional
System Pressure
5000 lbf/in
2
maximum
3000 lbf/in
2
continuous
The high pressure relief valves are all factory preset and cannot
be readjusted.
The pressure setting and assembly number is stamped on each
high pressure relief valve cartridge.
Valve Identification Example:
32060-IA
5000
Relief Valve Setting
Relief Valve Assembly Number
Model 70142 / 70144 and 70145
Fault - Logic
Trouble Shooting
Diagram Action Step Comments
1
Inspect External Control Linkage for:
a. misadjusted or disconnected
b. binding, bent, or broken
c. misadjusted, damaged or broken neutral return spring
2
Inspect Servo Control Valve for: (if used)
a. proper inlet pressure
b. misadjusted, damaged or broken neutral return spring
c. galled or stuck control spool
d. galled or stuck servo piston
3
Inspect System Relief Valves * for:
a. improper pressure relief setting
b. damaged or broken spring
c. valve held off seat
d. damaged valve seat
4
Check Oil Level in Reservoir:
a. consult owner/operators manual for the proper type
fluid and level
5
Inspect Heat Exchanger for:
a. obstructed air flow (air cooled)
b. obstructed water flow (water cooled)
c. improper plumbing (inlet to outlet)
d. obstructed fluid flow
6
Inspect Heat Exchanger By-Pass Valve for: (if used)
a. improper pressure adjustment
b. stuck or broken valve
7
Inspect Dump Valve for: (if used)
a. held in a partial or full open position
8
Inspect Inlet Screen or Filter for:
a. plugged or clogged screen or filter element
b. obstructed inlet or outlet
c. open inlet to charge pump
9
Check System Pressure:
a. See figure 3-1 for location of pressure gauge
installation.
b. consult owner/operators manual for maximum system
relief valve settings
10 Check Charge Pressure:
a. See figure 3-1 for location of pressure gauge
installation.
b. consult owner/operators manual for maximum charge
relief valve settings